Abstract
Abstract Clomazone is a widely used herbicide in California water-seeded rice for control of bearded sprangletop and watergrass. Generally, clomazone is applied to a flooded rice field at day of rice seeding. However, interest exists among growers to delay the clomazone application. Weather variability may encourage growers to practice Leathers’ method. Leathers’ method is the practice of draining the field 1 to 2 d after air seeding to encourage better and more uniform seedling establishment, then reflooding back to a 10- to 15-cm flood 4 to 7 d later. Therefore the objective of this study was to evaluate grass weed control and rice response at four rates of clomazone, applied at two timings: at day of seeding (DOS) in a continuous 10-cm flood and after Leathers’ method. This study was conducted in 2019 and 2020 at the Rice Experiment Station in Biggs, CA. In 2019, there were no difference across clomazone rates on control of bearded sprangletop independent of application timing used; however, in 2020, bearded sprangletop control with clomazone applied after Leathers’ method was 70% to 71% across clomazone rate by 60 d after treatment (DAT), compared to 92% to 97% in the DOS applications. Watergrass control was 100% in 2019 across clomazone rate and application timing. However, in 2020, watergrass control was greater at the DOS application at 54% to 71%. Clomazone applied at the 0.7 kg ha −1 Leathers’ method resulted in 84% bleaching by 14 DAT and was similar across all Leathers’ method clomazone applications and the 0.7 kg ha −1 DOS application. There was no rice grain yield difference among all clomazone-treated plots, with the exception of the 0.7 kg ha −1 Leathers’ method interaction with the DOS applications.
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Claims 7
Claim · model-written summary
In 2019, bearded sprangletop control did not differ across clomazone rates, independent of application timing.
- Taxon
- rice
Oryza sativae2 - Treatment
- clomazonee2
- Interactor
- bearded sprangletope1weed
- Outcome
- control of bearded sprangletope1
- Direction
- no differencee1
- Comparator
- across clomazone ratese1
- Setting
- Rice Experiment Station in Biggs, CAe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 2019, there were no difference across clomazone rates on control of bearded sprangletop independent of application timing used”
e2“evaluate grass weed control and rice response at four rates of clomazone, applied at two timings”
e3“This study was conducted in 2019 and 2020 at the Rice Experiment Station in Biggs, CA”
Claim · model-written summary
In 2020, bearded sprangletop control with clomazone applied after Leathers method was 70% to 71% at 60 DAT, lower than 92% to 97% in day-of-seeding applications.
- Taxon
- riceOryza sativae2
- Treatment
- clomazone applied after Leathers’ methode1
- Interactor
- bearded sprangletope1weed
- Outcome
- bearded sprangletop controle1
- Direction
- lowerinferrede1
- Value
- 70% to 71%e1
- Comparator
- the DOS applicationse1
- Setting
- Rice Experiment Station in Biggs, CAe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in 2020, bearded sprangletop control with clomazone applied after Leathers’ method was 70% to 71% across clomazone rate by 60 d after treatment (DAT), compared to 92% to 97% in the DOS applications”
e2“evaluate grass weed control and rice response at four rates of clomazone, applied at two timings”
e3“This study was conducted in 2019 and 2020 at the Rice Experiment Station in Biggs, CA”
Claim · model-written summary
In 2019, watergrass control was 100% and did not differ across clomazone rates or application timings.
- Taxon
- riceOryza sativae2
- Treatment
- clomazonee2
- Interactor
- watergrasse1weed
- Outcome
- Watergrass controle1
- Direction
- no_changeinferrede1
- Value
- 100%e1
- Comparator
- across clomazone rate and application timinge1
- Setting
- Rice Experiment Station in Biggs, CAe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Watergrass control was 100% in 2019 across clomazone rate and application timing”
e2“evaluate grass weed control and rice response at four rates of clomazone, applied at two timings”
e3“This study was conducted in 2019 and 2020 at the Rice Experiment Station in Biggs, CA”
Claim · model-written summary
In 2020, watergrass control was greater with day-of-seeding application, at 54% to 71%.
- Taxon
- riceOryza sativae2
- Treatment
- DOS applicatione1
- Interactor
- watergrasse1weed
- Outcome
- watergrass controle1
- Direction
- greatere1
- Value
- 54% to 71%e1
- Setting
- Rice Experiment Station in Biggs, CAe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in 2020, watergrass control was greater at the DOS application at 54% to 71%”
e2“evaluate grass weed control and rice response at four rates of clomazone, applied at two timings”
e3“This study was conducted in 2019 and 2020 at the Rice Experiment Station in Biggs, CA”
Claim · model-written summary
Clomazone at 0.7 kg ha −1 applied after Leathers method caused 84% bleaching by 14 DAT.
- Taxon
- riceOryza sativae2
- Treatment
- Clomazone applied at the 0.7 kg ha −1 Leathers’ methode1
- Outcome
- bleachinge1
- Direction
- increaseinferrede1
- Value
- 84%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Clomazone applied at the 0.7 kg ha −1 Leathers’ method resulted in 84% bleaching by 14 DAT and was similar across all Leathers’ method clomazone applications and the 0.7 kg ha −1 DOS application”
e2“evaluate grass weed control and rice response at four rates of clomazone, applied at two timings”
Claim · model-written summary
Bleaching from clomazone at 0.7 kg ha −1 after Leathers method was similar to the 0.7 kg ha −1 day-of-seeding application.
- Taxon
- riceOryza sativae2
- Treatment
- Clomazone applied at the 0.7 kg ha −1 Leathers’ methode1
- Outcome
- bleachinge1
- Direction
- similare1
- Comparator
- the 0.7 kg ha −1 DOS applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Clomazone applied at the 0.7 kg ha −1 Leathers’ method resulted in 84% bleaching by 14 DAT and was similar across all Leathers’ method clomazone applications and the 0.7 kg ha −1 DOS application”
e2“evaluate grass weed control and rice response at four rates of clomazone, applied at two timings”
Claim · model-written summary
Among all clomazone-treated plots, rice grain yield did not differ, except for the 0.7 kg ha −1 Leathers method applied with DOS applications.
- Taxon
- riceOryza sativae1
- Treatment
- clomazonee1
- Outcome
- rice grain yielde1
- Direction
- no_changeinferrede1
- Qualifier
- with the exception of the 0.7 kg ha −1 Leathers’ method interaction with the DOS applicationse1
- Comparator
- all clomazone-treated plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There was no rice grain yield difference among all clomazone-treated plots, with the exception of the 0.7 kg ha −1 Leathers’ method interaction with the DOS applications”
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See all 18 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.